• Title/Summary/Keyword: Coplanar Wave Guide

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Wide Band Monopole Antenna by Modified Ground of Coplanar Waveguide (CPW 급전의 접지면을 변형한 광대역 모노폴 안테나)

  • Lee, Hyeon-Jin
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.60 no.2
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    • pp.53-55
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    • 2011
  • The printed wide band monopole antenna having characteristics of dipole by modified coplanar wave guide(CPW) ground plane is presented. We are called a slot-arm printed monopole antenna and investigated the effect of the surface currents of the radiator on ground plane. The proposed antenna is treated as two asymmetric dipoles with the included angle of $90^{\circ}$ degrees which lie along Z-direction symmetrically. It is observed that the effect of the surface currents on the radiation patterns is similar to that of the corresponding dipole. The length and width of the ground plane correspond the radius and length of the dipole respectively. This approach is also valid to general printed monopole antennas. The simulation impedance bandwidth of the proposed antenna the range of 2.4 to 4.6 [GHz] for a voltage stand wave ratio (VSWR)${\leq}$2 and got pick gain of 6 [dBi]. So the proposed antenna is satisfied the requirement of the industry science medical (ISM) band operation.

Suppression of Parasitic Resonance Modes for the Millimeter-Wave SiP Applications (밀리미터파 SiP 응용을 위한 기생 공진 모드 억제)

  • Lee Young-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.9 s.112
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    • pp.883-889
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    • 2006
  • In this paper, parasitic resonance modes generated in a conductor backed coplanar wave guide(CBCPW) and stripline band pass filter(BPF) and the oscillation phenomena of a 40 GHz power amplifier module(PAM) are analyzed and several methods to suppress them are presented for low-temperature co-fired ceramic(LTCC) based millimeter-wave RF System-in-Package(SiP) applications. Parasitic rectangular wave guide(RWG) modes of the CBCPW structure are completely suppressed in the operation frequency band by decreasing the distance between its vias and by increasing the mode frequency. In the stripline structure, RWG resonance modes are clearly eliminated by removing some vias facing each other and by placing them diagonally. In the case of the 40 GHz PAM, in order to reduce a cross talk due to radiation that is generated from interconnection discontinuities, high isolation structures such as embedded DC bas lines and CPW signal lines are used and then the oscillated PAM is improved.

A FG-CPW Single Balanced Diode Mixer for C-Band Application (C-Band 용 FG-CPW 단일 평형 다이오드 혼합기)

  • Bae, Joung-Sun;Lee, Jong-Chul;Kim, Jong-Heon;Lee, Byung-Je;Kim, Nam-Young
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.3
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    • pp.339-345
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    • 2001
  • In this paper, FG-CPW (Finite-Ground Coplanar Wave-Guide) balanced diode mixer is presented. Frequency bandwidth is selected for a C-band, which is 5.72~5.82 GHz for RF, 5.58~5.68 GHz for LO, and 140 MHz for IF signals. A rat-race hybrid is designed for the accomplishment of single balanced type. A low pass filter (LPF) with CPW structure is used far good conversion loss and unwanted harmonics suppression. When LO signal with the power of 4 dBm at 5.635 GHz is injected, a conversion loss of 6.2 dB is obtained for the mixer. Also, the LO to RF and LO to IF isolation of 30 dB and 40 dB are obtained, respectively. This mixer can be used in the area on wireless LAN application.

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A study on basic characteristics of transmission lines employing various periodic strip structures on silicon substrate for a miniaturization of RF components (RF 소자의 소형화를 위해 실리콘 박막상에서 다양한 형태의 주기적 스트립 구조를 가지는 전송선로의 기본특성 연구)

  • Han, Sung-Jo;Jeong, Jang-Hyeon;Yun, Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.1
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    • pp.70-77
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    • 2014
  • In this work, we studied basic characteristics of transmission lines employing various PSS (periodic strip structure) on silicon substrate for application to a miniaturization of RF components. According to the results, the transmission lines employing various PSS showed wavelength shorter than conventional coplanar waveguide due to their strong wave characteristics. Especially, with-contact structure was most effective for a miniaturization of RF component. Concretely, the size of the transmission line employing with-contact was only 4.39 % of the conventional coplanar waveguide, According to the bandwidth extraction result, the bandwidth of the transmission lines employing various PSS structures were wider than 384 GHz. Above results indicate that the transmission lines employing various PSS can be effectively used for application to a broadband and miniature RF component, and especially, with-contact is most effective for a miniaturization of RF components.

A FG-CPW Rat-race Diode Mixer for Wireless LAN Application (5.8 GHz 무선 LAN 대역의 FG-CPW Rat-race Diode Mixer)

  • 배중선;이종철;김종헌;이병제;김남영
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2000.11a
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    • pp.193-196
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    • 2000
  • 본 논문에서는 FG-CPW(Finite-Ground Coplanar Wave-Guide) 구조의 단일 평형 다이오드 믹서에 대해서 논의된다. 주파수 영역은 무선 LAN 대역으로 선택하였다. RF 신호는 5.725-5.875 GHz, LO 신호는 5.58GHz, 그리고 IF 신호는 140 MHz가 사용된다. 제시된 FG-CPW 구조의 LPF(low pass filter)는 회의크기를 줄일 수 있으며, 불필요한 하모닉 억제 특성이 우수하다. 5.635 GHz에서 5 dBm의 Power를 갖는 LO신호가 입력될 때 6.2 dB 의 혼합기의 변환손실을 얻는다. 또한 LO-RF isolation과 LO-IF isolation은 각각 30 dB $\Omega$dB 의 특성을 보인다. 이 혼합기는 CPW 구조가 일반적으로 알려진 밀리미터 대역에서의 장점뿐만 아니라 C-Band의 무선 LAN 분야에도 충분히 응용될 수 있으리라 기대된다.

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Spin Dynamics in CoFeB Nanowires using Micro-fabricated Coplanar Wave Guide

  • Cho, Jaehun;Yoon, Jungbum;Yuya, Fujii;Katsunori, Konishi;Yoshishige, Suzuki;You, Chun-Yeol
    • Proceedings of the Korean Magnestics Society Conference
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    • 2013.05a
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    • pp.74-75
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    • 2013
  • In summary, the ferromagnetic resonance experiments was applied to investigate the magnetic properties of $Co_{16}Fe_{64}B_{20}$ thin films and nanowire patterns. We find that the saturated magnetization and demagnetization factors. And we will compare experimental result with the micromagnetic simulations.

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A CPW-Based 77 GHz Power Amplifier with Cascode Structure Using a 130 nm In0.88GaP/In0.4AlAs/In0.4GaAs mHEMTs

  • Kim, Young-Min;Koh, Yu-Min;Park, Young-Rak;Lee, Si-Young;Seo, Kwang-Seok;Kwon, Young-Woo
    • Journal of electromagnetic engineering and science
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    • v.9 no.4
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    • pp.218-222
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    • 2009
  • In this paper, we present a CPW-based 77 GHz 3-stage power amplifier MMIC for automotive radar systems. The power amplifier MMIC has been realized using a 130 nm $In_{0.88}$GaP/$In_{0.4}$AlAs/$In_{0.4}$GaAs metamorphic high-electron mobility transistors(mHEMTs) technology and an output stage with a cascode configuration. This produced a good output power and gain performance at 77 GHz. The fabricated power amplifier MMIC exhibited a small-signal gain of 18 dB, an output power of 17 dBm and 9 % power added efficiency(PAE) at 77 GHz with a total gate width of 800 ${\mu}m$ in the output stage. These performances could be useful to low-cost and small-sized components for 77 GHz automotive radar systems.